K4 vs Mazda3
Brand preference aside, the K4 and the Mazda3 are close competitors, both pitched at compact car buyers. You can’t have it all with either one. The K4 is the fuel economy & range pick, and the Mazda3 is the engine & performance pick.
At a glance
- Engine & Performance Mazda3 wins
- Fuel Economy & Range K4 wins
- Space & Practicality Tie
- Off-road & Towing Mazda3 wins
- Safety & Tech K4 wins
- Engine & Performance0.0
- Fuel Economy & Range5.9
- Engine & Performance2.8
- Fuel Economy & Range4.8
Spec scores (0 to 10) are calculated from manufacturer specs against other models in the same class. See how the formula works. They are not reviews or user ratings.
Key Differences
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The Mazda3 has 44 hp more power
If total system output is one of your priorities, this settles it: the Mazda3 leads clearly with 191 hp to the K4’s 147 hp. More power helps with merging, overtaking and climbing hills, especially with passengers and luggage on board.
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The Mazda3 has 54 lb-ft more torque
The numbers aren’t close. The Mazda3 lists 186 lb-ft for torque, while the K4 lists 132 lb-ft. More torque means stronger pulling from low speeds, which you feel when accelerating from a stop or climbing grades.
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The K4 has better fuel economy
It’s a small lead (34 mpg versus 31 mpg), but it’s real, and it goes to the K4. Official figures rarely match real-world driving exactly, but the ranking between two cars tends to hold.
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The K4 has a bigger 12.3 in touchscreen
The Mazda3 isn’t far behind at 10.3 in, but the K4’s 12.3 in still comes out ahead. A bigger touchscreen makes maps and phone mirroring easier to read at a glance.
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The K4 has better city fuel economy
A narrow win for the K4. With 30 mpg to 27 mpg, it’s the kind of difference that adds up rather than stands out. In town, driving style has a big effect, but the K4 starts from a better baseline.
Design & Size
The footprint is practically the same, so size is not a reason to pick one over the other.
Dimensions
| Spec | K4 | Mazda3 |
|---|---|---|
| Length | 185.8 in | 183.5 in |
| Width (no mirrors) | N/A (not specified) | 70.7 in |
| Height | N/A (not specified) | 56.9 in |
| Wheelbase | 107.1 in | 107.3 in |
Engine & Performance
Mazda3 leads
In this area the Mazda3 has a lead the K4 can’t close. The Mazda3 steps ahead thanks to 44 hp more power. The Mazda3’s extra output gives it more in reserve when you need to get up to speed. Bottom line for engine & performance: the Mazda3 has the edge.
Total system output
K4: 147 hp Mazda3: 191 hp Power is only part of the story; weight, gearing and torque delivery shape how quick a car feels.
Torque
K4: 132 lb-ft Mazda3: 186 lb-ft The Mazda3’s extra torque makes it more relaxed when fully loaded or towing.
Fuel Economy & Range
K4 leads
The K4 dominates the fuel economy & range section, and the gaps are large enough to matter in daily use. The K4 makes its case with better fuel economy. Better combined fuel economy lowers your running costs every week, and the savings add up over years of ownership. If fuel economy & range is your priority, the K4 is the car to pick.
Fuel economy (combined)
K4: 34 mpg Mazda3: 31 mpg The K4 uses less fuel on the standard combined cycle, which matters most if you drive a lot.
Fuel economy (city)
K4: 30 mpg Mazda3: 27 mpg City fuel economy matters most if your driving is mostly short trips, traffic and stop-and-go commutes.
Space & Practicality
Too close to call
Swap one for the other and you’d lose nothing on space & practicality. Both cover space & practicality well enough that other priorities should break the tie.
Off-road & Towing
Mazda3 leads
The Mazda3 does a little better in the off-road & towing section, though nothing here is a deal-breaker for the K4. The Mazda3 wins here with available all-wheel drive. The Mazda3 offers all-wheel drive; the K4 doesn’t, which matters if you face harsh winters. For off-road & towing, the Mazda3 is the one to beat.
AWD / 4WD available
K4: no Mazda3: yes All-wheel drive helps you get going on slippery roads, but good tires matter just as much for stopping and turning.
Safety & Tech
K4 leads
It’s a narrow one, but the safety & tech round goes to the K4. The K4 scores with a bigger 12.3 in touchscreen. The K4’s larger display gives navigation and menus more room. Prioritize safety & tech, and the K4 is where you should land.
Largest touchscreen
K4: 12.3 in Mazda3: 10.3 in Screen size isn’t everything (physical controls and software speed matter too), but bigger is easier to read.
Full Specifications
Engine & Performance
| Spec | K4 | Mazda3 |
|---|---|---|
| Powertrain | Gas | Gas |
| Engine | 2.0L I4 | 2.5L I4 |
| Total system output | 147 hp | 191 hp (winner) |
| Torque | 132 lb-ft | 186 lb-ft (winner) |
| Transmission | IVT (CVT) | 6-speed automatic |
| Drivetrain | FWD | FWD (AWD available) |
Fuel Economy & Range
| Spec | K4 | Mazda3 |
|---|---|---|
| Fuel economy (combined)EPA estimate where available | 34 mpg (winner) | 31 mpg |
| Fuel economy (city) | 30 mpg (winner) | 27 mpg |
| Fuel economy (highway) | 40 mpg (winner) | 37 mpg |
Space & Practicality
| Spec | K4 | Mazda3 |
|---|---|---|
| Seats | 5 seats | 5 seats |
| Cargo (behind rear seats) | N/A (not specified) | 13.2 cu ft |
Off-road & Towing
| Spec | K4 | Mazda3 |
|---|---|---|
| AWD / 4WD available | No | Yes (winner) |
Safety & Tech
| Spec | K4 | Mazda3 |
|---|---|---|
| Largest touchscreen | 12.3 in (winner) Biggest touchscreen | 10.3 in |
| Driver-assist suite | Kia Drive Wise | Mazda i-Activsense |
| Basic warranty | 5 yr / 60,000 mi | 3 yr / 36,000 mi |
Dimensions
| Spec | K4 | Mazda3 |
|---|---|---|
| Length | 185.8 in | 183.5 in |
| Width (no mirrors) | N/A (not specified) | 70.7 in |
| Height | N/A (not specified) | 56.9 in |
| Wheelbase | 107.1 in | 107.3 in |
“N/A” means the manufacturer does not specify the value or we could not confirm it. Figures marked “manufacturer rating” are the maker’s own claims, not our measurements.
Which One Should You Buy?
Choose the K4 if…
- you want better combined fuel economy (34 mpg vs 31 mpg)
- you rely on navigation and phone mirroring on a larger display (12.3 in vs 10.3 in)
- you mostly drive in town (30 mpg vs 27 mpg in the city)
- you cover long highway distances (40 mpg vs 37 mpg on the highway)
Choose the Mazda3 if…
- you want more power (191 hp vs 147 hp)
- you want more pulling power from low speeds (186 lb-ft vs 132 lb-ft of torque)
- you want all-wheel drive available
Also Compared
Frequently Asked Questions
Should I buy the K4 or the Mazda3?
There’s no single right answer. The K4 leads on fuel economy & range and the Mazda3 on engine & performance.
Is the K4 bigger than the Mazda3?
They’re practically the same size. The difference between the K4 and the Mazda3 is too small to matter.
Executive Summary
Let’s set the logos aside for a minute. The K4 and the Mazda3 are close competitors, and their spec sheets tell an interesting story. It’s hard to argue with better fuel economy, which is exactly what the K4 brings. I’d also count a bigger 12.3 in touchscreen in the K4’s favor. In fairness to the Mazda3, 44 hp more power is a genuine strength.
Fit matters more than scores here. The K4 suits buyers focused on fuel economy & range; the Mazda3 suits those focused on engine & performance.
My pick: I’d go with the K4 if I cared most about fuel economy & range, and the Mazda3 if engine & performance mattered more.
Personal opinion based on the data above. Your priorities may differ.